, 166:285 | Cite as

Secreted Proteases from Dermatophytes

  • Michel Monod


Dermatophytes are highly specialized pathogenic fungi that exclusively infect the stratum corneum, nails or hair, and it is evident that secreted proteolytic activity is important for their virulence. Endo- and exoproteases-secreted by dermatophytes are similar to those of species of the genus Aspergillus. However, in contrast to Aspergillus spp., dermatophyte-secreted endoproteases are multiple and are members of two large protein families, the subtilisins (serine proteases) and the fungalysins (metalloproteases). In addition, dermatophytes excrete sulphite as a reducing agent. In the presence of sulphite, disulphide bounds of the keratin substrate are directly cleaved to cysteine and S-sulphocysteine, and reduced proteins become accessible for further digestion by various endo- and exoproteases secreted by the fungi. Sulphitolysis is likely to be an essential step in the digestion of compact keratinized tissues which precedes the action of all proteases.


Aspergillus Dermatophytes Microsporum Secreted proteases Trichophyton 





Dipeptidyl peptidase


Delayed-type hypersensitivity


Immediate hypersensitivity


Leucine aminopeptidase






Molecular mass


Mass spectrometry




Phenyl methyl sulphonyl fluoride


Serine carboxypeptidase





We thank Dr. Sandy Vermout, Dr. Peter Staib and Dr. Massimo Lurati for their critical review of the manuscript and assistance with the English. This work was supported by the Swiss National Foundation for Scientific Research, grant 3100-105313/1.


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Service de Dermatologie et Vénéréologie, Laboratoire de Mycologie, BT422Centre Hospitalier Universitaire VaudoisLausanneSwitzerland

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